The 38-year-old won two Premier League titles and the League Cup in his three years at Stamford Bridge, and has hailed the impact Mourinho had on the club.

Duff feels that the Portuguese made a notable difference to the team’s mentality when he replaced Claudio Ranieri, and he clearly still feels strongly about his old manager, calling him the best he’s worked with.

Damien Duff spent three years at Chelsea (Picture: Getty)

Mourinho is now at Chelsea’s rivals Manchester United (Picture: Getty)

‘There was definitely a shift in the mentality once Mourinho had come in,’ Duff told FourFourTwo.

‘There’s no doubt he’s the best manager I ever worked with. He squeezes every last ounce out of you and the training sessions he put on were unbelievable. He had us believing from day one that we would be champions. We ended up steamrollering everyone in that first season – even when we weren’t playing well, we had a belief that we’d still win.

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‘Mourinho going to Manchester United has helped to reignite my love for United, I used to support them as a kid, but when I went to Chelsea I stopped.

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